Fastener-applying device



Feb. 8, 1938, J. F. cAvANAGH FASTENER APPLYING DEVICE Filed March l2, 1936 3 Sheets-Sheet 1 Feb. 8, 1938.

J. F, CAVANAGH FASTENER APPLYING DEVICE Filed March l2, 1936 3 Sheets-Sheet 2 Feb.8,1938. J F, CAVANAGH 2,107,522

I FASTENER APPLYING DEVICE u Filed March l2, 1936 5 Sheets-Sheet 3 ff f7 ff Patented Feb. 8, 1938 UNITED STATES PATENT OFFICE Boston Wire Stitcher Company, Portland,

Maine, a corporation of Maine Application March 12, 1936, Serial No. 68,506

29 Claims.

This invention relates to improvements in fastener-applying devices such as stapling implements for attaching papers and other sheets, for stitching the flaps of cartons, for securing tags and labels to articles of commerce and for use generally in fastening or stitching together various objects and articles.

One of the objects of the invention is to provide an implement of the type indicated which lo may be held and manipulated by one hand to apply the fasteners to the work.

Another object of the invention is to provide an implement of the type indicated having compound levers for increasing the mechanical advantage or ratio of power to resistance whereby fasteners may be easily applied to relatively thick and hard materials.

Another object of the invention is to provide an implement of the type indicated in which a 29 floating roller provides a bearing element between the levers and is moved by one lever along the other lever to gradually increase the mechanical advantage with a minimum of friction.

Another object of the invention is tol provide g5 an implement of the type indicated having improved features of construction which provide for ease and economy of manufacture and facilitate the assembly of the parts.

Another object of the invention is tol provide g3 an implement of the type indicated having a simple and compact mechanism which is positive and efficient in operation and adapted for use over long periods of time without repair or replacement of the parts.

3.3 Further objects of the invention are set forth in the following specification which describes a preferred form of construction of the invention, by way of example only, as illustrated by the accompanying drawings. In the drawings:

4,0 Fig. l is a side elevational view of a fastenerapplying implement embodying the novel features of the present invention;

Fig. 2 is a. front elevational view of the implement shown with the magazine-gate partly 45 broken away to illustrate the relationship of the magazine and fastener-applying means;

Fig. 3 is a vertical sectional view of the implement taken on line 3 3 of'Fig. 2 and showing the mechanism for actuating the fastener-applying means; Y

Fig. 4 is a similar vertical sectional view showing the relation of the elements of the actuating mechanism at the completion of va fastener-ap- 55 plying operation;

Fig. 5 is a perspective view of the fastenerapplying unit;

Fig. 6 is a transverse sectional view taken on line 6 6 of Fig. 3 showing the manner of attaching the two-part frame and the base-plate in assembled relationship;

Fig. 7 is a transverse sectional view taken on line 7 1 of Fig. 3 showing the pivotal mounting for the fastener-applying unit on the frame;

Fig. 8 is a transverse sectional view taken on line 8 8 of Fig. 3 showing the bearing roller in operative position between the levers;

Fig. 9 is a longitudinal sectional view taken on line 9 9 of Fig. 3 showing the retainer for restraining the fasteners from ejection from the magazine when the gate is opened and the pawl for controlling the fastener-applying means;

Fig 10 is a fragmentary perspective View of the forward end of the core for supporting the fasteners;

Fig. 11 is an enlarged fragmentary sectional View similar to Fig. 4 showing the operative position of the one-way pawl during a downward stroke whereof it prevents a return movement of the fastener-applying means until a full stroke has been completed; Fig. 11a is a view similar to Fig. 11 showing the operative position of the one-way pawl during a return stroke whereof it prevents a subsequent operation of the fastenerapplying means until a full return stroke has been completed;

Fig. 12 is a side elevational view of the'fastener-applying unit shown partly in section with the magazine-gate moved to an open position and the fasteners engaged by the retainer pawl; Fig. 13 is an enlarged part-sectional plan view of the rearward end of the staple-core showing the means for anchoring the bowed spring to which the end of the staple-pusher cord is attached.

The present invention relates generally to a fastener-applying implement comprising a hollow frame formed with a hand-grip so that the implement may be held and operated by one hand. Fastener-applying mechanism movably mounted in the frame is operated by a pair of spaced levers so arranged as to augment the manually applied power. The levers are pivoted at one end with the movable end of one overlying the hand-grip and the movable end of the other connected to the fastener-applying mechanism. A bearing roller is movably mounted in guideways in the frame and engages between the levers to transmit motion from one to the other. Preferably, the levers have cam-faces engaged by the bearing roller which together with the dened path of movement of the roller operate the mined motion. An anvil connected with the frame of the implement is preferably in the form of a blade having clinc'ning grooves at its end for co-operation with the fastener-applying mechamsm.

Referring te the drawings, the implement as herein illustrated comprises a hollow frame see Fig. 1, preferably made in two separable parts I I and I2 of identical form as shown in Fig. 6, but of opposite hand; the separable parts being adapted to be die cast of a suitable light material such as aluminum alloy. The separable parts II and I2 have web-like side walls with inwardlydirected marginal flanges, the edges of which abut each other to form a wall I3, see Fig. 8, extending along the bottom, rear and top of the frame and a forward wall i4, see Fig. 3, with openings I5 and I6 therebetween. At the upper rearward portion of the frame Il) the side walls of the members II and I2 havingA alining openings I 1 suitably formed to provide a hand-grip for the insertion of the fingers therethrough to adapt the implement to be held in one hand. Preferably, an insert I8 of soft rubber or other suitably resilient Vmaterial is mounted in the openings I'I to provide a cushion for the hand. As illustrated in Figs. 6 and '7, the insert I8 has marginal recesses I9 at its opposite sides which are engaged by the edges of the openings I'I. The cooperating frame parts II and I2, shown in Fig.Y 6, also havey ribs 2| disposed with their edges abutting, and opposite recessed guideways 23 and 24, see Figs..3 and 8, inclined downwardly toward the front of the frame and adapted to flmction for a purpose to be later explained.

The frame I is mounted in a member 3G having a flat base with opposite spaced flanges 3| and 32 which embrace the outer sides of the cooperating parts II and The base of the member 3l] is extended forwardly in the form of a blade 33 which serves as an anvil for cooperation with the fastener-applying means. AS iliustrated in Figs. l and 6, the flat bottom portion of the wall I3 at the rearward end of the frame I0 is seated against the fiat base of the member 30 and each of the flanges 3| and 32 has holes 31 which aline with holes 38 in the rame parts II and l2. The two parts II and I2 of the frame I0 are held inV assembled relationship in the nase-member 38 by means of a screw 3E extending through the alined holes 31 and 38 in the flanges and frame and screwed into the hole 3! in one of the flanges which is tapped to receive the threads of the screw, see Fig. 6. At the forward end of the frame I0 the two parts Il and I2 are clamped together in cooperative relationship by means of a stud 39 extending through suitable holes in the parts as shown in Fig. 2. Preferably, the stud 39 has a head 4E at one end abutting the outward side of the part I2 and a tapped axial hole 4I at its opposite end for receiving a screw 42, the head of which is set up against the outward side of the opposite part II. The forwardly-projecting anvil-blade 33 on the base-member 38 underlies the frame 18 and is relatively thin to adapt it to be inserted between the iiaps of a carton or to receive work of any description. The blade 33 has clincher-grooves 43 at its forward end for receiving thel ends of the legs' of staples driven -through the work to clinch them against the under side thereof.

A lever 45 is pivctally mounted on the stud 39 at one end with its arched handle-portion 45 extending rearwardly to overlie the frame IIJ above the openings il, thereby forming a handgrip to adapt the implement to be operated with the same hand in which it is held. Preferably, the lever 45 is constructed from sheet-metal folded into channel shape to provide depending side iianges 4l and 48 and curved gradually throughout its length. The flanges 41 and 48 at the forward end of the lever 45 are shaped to provide hub portions 49 which t closely between the opposite inward sides of the frame parts II and I2 and provided with alining holes for receiving a bearing sleeve 55 which embraces the stud 39. Adjacent the hub portions t9, see Fig. 4, the flanges 4l! and 48 of the lever extend into the opening l between the two parts Il and I2 of the frame I0 and their terminal edges are shaped to provide cam-faces 5I and 52 which extend at an acute angle to the guiding grooves 23 and 24 in the frame.

The fastener-applying unit, illustrated in Fig. 5, is pivot-ally mounted in the frame I0 and cooperates 'with the blade 33 to apply the fasteners to the work. As herein illustrated, the unit is adapted to apply U-shaped staples s to the work and comprises a magazine 55 having a channelshaped supporting member 55, preferably constructed from sheet-metai, with a bottom 51, upstanding sides 5S and anges 59 folded inwardly from its sides to extend partly across the open top of the member, see Figs. 3 and 8. The supporting member 5S has spaced ears 69, see Fig. 5, at its rearward end which are bent upwardly from the anges 59 and pierced with alining holes 5 I At its forward end the supporting member 55 has stanchions 62 bent upwardly from the anges 59 and extending forwardly to overhang the end of the member. `Each ef the stanchicns 52 has a relatively wide slot 63 with a narrow neck 64 extending to the upper edge for a purpose to be later explained.

Welded, riveted or otherwise suitably secured to the bottom 51 of thesupporting member 55 is a staple-core 65 of substantially the same length as the supporting member but with its forward end 56 projecting therebeyond and underlying the stanchions B2.V The core 65 is formed with a bottom 61 and upstanding sides 58 across the top of which the staples s are adapted to be alined in straddled relationship withv their legs rreceived in the spaces between the sides of the core 65 and the sides of the supporting member 55; the flanges 59 .and forwardly-extending stanchions 52 overlapping the heads or crossbars of the staples to hold them from rising up on the core 65. The staples s preferably have crowned heads and as illustrated in Fig. l0, the forwardly-projecting end 65 of the core 65 has inwardly-directed anges forming an arch 69 of a contour corresponding to the crown of the staples. On the outward sides of the forwardiyprojecting end 56 of the core 55 and adjacent the bottom edges thereof are spacing anges 'It formed with laterally-projecting lugs 'II employed for a purpose later to be explained. A trough-shaped shield I2, see Figs. 9 and ll, is mounted between the stanchions 52 at the forward end of the magazine forming a continuation of the arch 59 at the 'end of the core 65. The opposite sides of the shield 'I2 t closely between the stanchions 62, and the shield is held in position by pins 'i3 and 'f4 extending through its sides with their ends engaging holes in the stanchiens.

The staples s are slid forwardlyl in the magazine 55 to feed them successively into position to be driven by means of a pusher 15 of inverted U-shape straddling the sides of the core 65 and slidable thereon. The staple-pusher 15 is urged forwardly by an elastic cord 16 or the like having oneV end attached to a lug 11 on the staplepusher and extending forwardly around a guide 18 and then rearwardly of the core with its opposite end attached to a lug 19 on a bowed spring 80, see Fig. 3. The bowed spring is positioned between the sides 68 of the core 65 with one end bearing against the bottom of the core and laterally-extending ears 8| at its opposite end engaging slots 62V at the end of the supporting member 56, see Figs. 4 and 13.

As illustrated in Figs. 3 and 7, the magazine 55 is adapted to t closely between inwardly-directed bosses 83 on the separable parts and I2 of the frame l0 and is pivotally mounted on a pin 84 extending through suitable alined holes in the side anges 3| and 32 of the base-member 30, the frame parts and i2, and the rearward end of the U-shaped supporting member 56. As herein illustrated, the pin 84 is engaged by a rib 85 on the bowed spring 80 to frictionally hold it in place; and the pin is preferably provided with a groove 86 into which the rib projects to prevent it from being easily removed. From the foregoing description it will be apparent that the stapleapplying unit is adapted to be rocked about the pivot-pin 84 through the opening I6 in the frame I0 and toward the anvil or blade 33 on the basemember 30. Y

A door or gate 90 is pivotally mounted on the stanchions 62 for cooperation with the end of the staple-core 65 toform a throat 9| therebetween, see Figs. 5, 9, 11, and 12. The gate 90 is of U- shape in cross-section having a front wall 92 and opposite side walls 93 which project upwardly beyond the front wall. The side walls 93 are .slotted at their upper ends to provideV lugs 94 which are bent inwardly to form trunnions for the gate. At their lower` ends the side walls 93 are cut away to form notches 95 for cooperation with the latching lugs 1|, previously mentioned, on the projecting end 66 of the core 65. To mount the gate 90 on the magazine 55 the lugs or trunnions 64 are inserted into the slots 63 in the stanchions 62 by holding the gate 90 in the position illustrated in Fig..12 and sliding the lugs through the narrow neck portions 64 of the slots. The lugs 94 pivotally mount theV gate 90 on the stanchions to adapt it to'be rocked into closed position, as shown in Fig. 5, and the relatively long slots 63 permit the gate to be moved vertically on the stanchions to engage its notches 95 with the laterally-projecting latching'lugs 1| on the end 66 of the staple-core 65.

A staple-driver 96 is mounted to slide between the forward wall 92 of the gate 90 and the end of the staple-core 65. The lateral edges of the staple-driver 96 t closely against the opposite side walls 93 of the gate 90 andthe driver is adapted to be reciprocated in the throat 9| to drive the staples advanced along the staple-core 65 and into the throat. The upper end of the staple-driver 96 projects above the gate 90 and has a central slot 91, see Fig 5, a pair oi relatively long slots 98 arranged in spaced relation adjacent one side, and a shorter slot 99 therebetween, these several slots serving for a purpose to be later explained. A staple-retainer |00, shown in Fig. l2, is pivotally mounted on the pin 13 extending between the stanchions 62 and has a forward sharpened end |02 and a rearward abutment |03.' A spring |04 is coiled about the pin 13 with one extended end engaging the pin 14 which serves as a stop therefor while the other extended end engages the abutment |03 on the staple-retainer |00. The spring |64 normally urges the sharpened end or beak |02 of the retainer |00 through an opening |05 in the shield 12 to engage it with the staples s, the abutment 03 being then positioned at an inclination to the plane of movement of the staple-driver 96. When the gate 90 is rocked about its pivot to a closed position the staple-driver 96 will engage the abutment |03 and rock the staple-retainer |00 on the pin 13 to release the beak |02 from the staples in the manner illustrated in Fig. 4.

The staple-driver 96, shown most clearly in Fig. 5, is operated by a pivoted lever |06 positioned below and in spaced relation to the hand-operated lever 45. As herein illustrated, the lever |06 is of bifurcated form comprising two companion parts |01 and |08 having their forward portions welded, soldered or otherwise connected together and their rearward portions bent outwardly and then extending rearwardly in spaced-apart relationship. The lever |06 is pivotally mounted on the rearward end of the magazine 55 by means of a pin |09 extending through suitable holes in the spaced legs |01 and |08 and alined holes 6| in the ears 60 projecting upwardly from the supporting member 56. The rearward legs |01 and |08 of the lever |06 are held in spaced relationship by pins and ||2 having enlarged body portions abutting their inward faces and reduced ends which extend outwardly through the parts and project beyond the sides thereof, see Figs. 8 and l2. At its forward end the lever |06 is shaped to form a hook 3 which projects through the central slot 91 at the upper end of the staple-driver 96 to provide a driving connection therewith. Intermediate its ends the ylever 06 is formed with an angular cam-face ||4 arranged in juxtaposition to the cam-faces 5| and 52 formed by the terminal edges of the iianges 41 and 48 on the hand-operated lever 45.

l The driver-actuating lever 06 is normally held in raised position with respect to the supporting member 56 Vby a hairpin-shaped spring ||5 having its looped end embracing the top of the lever and its arcuately-bent legs projecting forwardly under the extended ends of the pin |2 with their terminal portions resting on the top of the inwardly-directed lugs or trunnions 94 of the gate 90. The spring ||5 thus tends to hold the actuating lever l06 inv a raised position and the gate 90 depressed to engage its notches 95 with the latching lugs 1| on the staple-core 65. The upward movement of the lever |06 is limited by suitable stops ||6 clearly shown in Fig. 5 as notched ears integral with and extending upwardly from the side walls 58 of the magazine 55 and positioned to be engaged by the extended ends of the |20 of the roller ||1 bears against the actuating` lever |06 while the two hubs |2I and |22 bear against the cam-faces and 52 on the handcperated lever 45 formed by the terminal edges of the side flanges 41 and 48. The roller ||1 is moved forwardly and downwardly in the guideways 23 and 24 by the cam-,faces 5| and 52 and along the actuating lever |00, the cam-face ||4 on the latter lever being so formed as to give the staple-driver S5 a predetermined motion.

The staple-applying unit as a whole is rocked with respect to the frame l0 about the pivot-pin 84 under the tension of a helical spring |2 Bvhaving one end looped around the pin ||2 between the spaced legs |01 and |08 of the lever |00 and the other end hooked to a pin |21 extending between the opposite parts and v|2 of the frame I0. The upward movement of the hand-operated lever 45, shown in Fig. 3, and thereby the movement of the fastener-applying unitV 55, both of which are under the influence of the spring |26, is limited by rearwardly-extending shoulders |28 on the depending flanges 41 and 48 of the handlever 45 which engage the pin |21.

The action of the staple-driver 95 is controlled by a one-way pawl |20 to prevent reverse movement of the driver until a full stroke has been completed in each direction. The pawl |29 is pivotally mounted on the pin 13 adjacent the staple-retainer |00 and has a blunt end which bears against the rearward face of the stapledriver 06 in line with the slots 93 and 99. The pawl |29 is resiliently urged into engagement with the staple-driver 90 by a helical spring |30 which is connected between a hook 13| on the rearward end of the pawl and the pin 14 extending between the stanchions 62. The device having now been described in detail its mode of operation will be next explained.

The implement is prepared for operation by loading the magazine 55 with a supply of staples s. For this purpose the gate 90 is lifted against the action of the ends of the hairpin spring H5, to release the notches 95 from engagement with the latching lugs 1 I, and then rocked on the trunnions 94 to the position shown in Fig. l2. As the gate 90 is moved away from the endof the magazine 55 the staple-retainer |00 is released and rocked by thev spring |04 to engage and hold any staples which may be contained in the magazine. The staples s are preferably united in the form of a stick which is pushed into the magazine 55 between the staple-core 65 and supporting member 50 to slide thestaple-pusher 15 rearwardly on the core. As the staples move rearwardly into the magazine 55 the staple-retainer |00 is rocked to permit them to be slid thereunder; but immediately engages the staples to prevent them from being ejected when released. After a supply of staples have been inserted into the magazine theV gate 90 is rocked back to its closed position into cooperative relation to the end of the staple-core 65 and latched by the engagement of the notches 95 with the lugs 1|. As the gate is moved vto closed position its forward wall 92 engages the abutmentr |03 of the staple-retainer. |00 to rock the latter about the pivot-pin 13 to inoperative position. The staplepusher 15 then acts to resiliently urge the staples forwardly along the staple-core 65. The inner walls of the sides 93 of the gate 90 engage the laterally-projecting flanges at the bottom of the staple-core 05, thus-providing spaces above the flanges at each side of the core for the legs of the staples to slide in. The engagement of the lugs or trunnions 94 by the extended ends of .the hairpin spring I 5 normally holds the gateV 90 in latched engagement with the lugs 1| on the staple-core 65.

rThe work w is placed on the anvil formed Vby .the blade 33, or the anvil may be inserted between the flaps of a carton to be stitched. `With the impiement held in one hand the operating lever 45'may be rocked about its pivot-stud 39 `by pressure of the fingers of the same hand. The cam-faces 5| and 52 formed by the terminal edges of the side iianges 41 and 48 of the lever 45 then act against the bearing roller ||1y to move it downwardly and forwardly in the guideways 23 and 24 in the frame |0.V Due to the resistance of the hairpin spring ||5, which is stronger than the spring |20, the staple-applying unit as a whole is rocked about its pivot 84 as the spring |20 yields until the forward end of the magazine 55 engages the work w in the manner indicated in Fig. 4. Upon further continued movement of the operating lever 45 the bearing roller ill' will continue its forward movement in the guideways 23 ,and 24 to rock the actuating lever |05 with respect to the magazine 55 as the hairpin spring H5 yields. The hook-and-slot connection ||3 and 91 between the actuating lever |00 and the staple-driver 95 causes the latter to be moved downwardly to drive the foremost staple s which has been advanced into the throat 9| by the staple-pusher 15.

Due to the pivotal connection of the levers 45 and |05 at opposite ends and the location of the bearing roller ||1 adjacent the forward ends of the levers the applied motion is reduced as it is transmitted to the staple-driver 00 whereby to increase the mechanical advantage and to provide for an easy application of the staples s to relatively thick and hard materials.r Further, due to the movement of the bearing roller ||1 forwardly between the levers-during the stapleapplying operation the mechanical advantage isv progressively increased toward the end of the operative stroke of the staple-driver as the clinching operation is performed. The legs of the staple s are engaged by the anvil-blade 33 and clinched by the grooves 43 therein' in the usual manner to set them against the under side of the work. The upper portion of the actuating lever |00 engaged by the bearing roller ||1 preferably has the inclined cam-face ||4 for actuating the staple-driver 96 with a predetermined quick motion, but this feature may be dispensedl with and the guideways for the roller may take shapes other than that herein shown.

After the stapling operation has been completed the hand-operated lever 45 is released, whereafter the actuating lever |06 will be raised to its inoperative position by the hairpin spring i5 .and the staple-applying unit as a whole raised by the'spring |20. Due to the angular relation of the guideways 23 and 24 with respect to the camfaces ||4 and 5|, 52 on the levers |05 and 45, respectively, the bearing roller ||1 is moved upwardly and rearwardly in the guideways to return the hand-operated lever 45 to the position shown in Fig. l. The upward movement of the driver- .actuating lever |06 is limited by. the engagement of the projecting ends of the pin with the stops and the upward movement of the stapleapplying unit is limited by the engagement of the rearwardly-extending shoulders |28 on the hand-operated lever 45 with the abutment-pin |21.

During the reciprocation of the staple-driver 'connected with the fastener-applying 96 the one-way pawl |29 is resiliently held against its rearward face by the spring |39. If the handoperated lever 45 is released before a stapledriving operation is completedor if the lever is pressed downwardly before the staple-driver 96 has completed a return stroke the driver is engaged by the blunt end of the pawl |29 at either the upper or lower edge vof the short slot 99 to prevent movement of the driver in the opposite direction, see Figs. ll and 11a. In other words, the end of the pawl |29 will dog against one edge of the slot 99 to hold the driver 96 from movement in the wrong direction before completing a full stroke either upwardly or downwardly. At the completion of either the driving or return strokes, however, the pawl |29 will project through one or the other of the long slots 98 so that when the direction of movement is reversed the paw] is rocked out of the way. The stapledriver 96 may then move with respect to the pawl |29 through its entire stroke.

As the actuating lever |96 returns the stapledriver 99 connected thereto to inoperative position after a staple has been applied to therwork a succeeding staple sis moved forwardly along the `staple-core 65 and into the throat 9| by the resiliently actuated staple-pusher 15. The lever 45 may then be vmanually rrocked to again oper- Y ate the staple-driver 96 to drive another staple into the work. The implement may thus be continuously operated until the supply of staples is exhausted, after which the magazine may be reloaded in the manner as previously explained.

It will be observed that the present invention provides a fastener-applying implement which may be held and operated by one hand to conveniently and easily apply yfasteners to relatively thick and hard materials. It will also be observed that due to the arrangement for compounding the leverage bymeans of the bearing roller movable longitudinally of the levers a mechanical `advantage is secured and friction between the moving parts materially reduced.V It will further be observed that the implement is of `simpleconstruction, positive and efcient in its operation, and adapted to be economically manufactured and assembled.

While the present improved Vimplement has been herein shown and described as embodied in a'preferr'ed form of construction itis to be understood that various modifications may be lmade in the structure and arrangement of its parts with- -out departing from the spirit or scope of the invention. Therefore, without limiting myself in this respect, I claim:

1. In a device of the type indicated, fastenerapplyingmeans, a lever connected with'the fastener-applying means, a second lever, means engaging between vthe levers and-movable longitudinally; of ,both levers, andmeanson one lever for moving the movable means longitudinally of the other lever to operate the fastener-applying .means with a progressively increased mechanical advantage. l

site ends, a roller engaging between the levers and :movablelongitudinally of both of the levers, one

Vof said levers having its free end connected with thefastener-'applying means, and means on the other lever for moving the roller alongthe lever means to vactuate the latter.

3. In a deviceof .the type indicated, fastenerapplying means, a Vlever connected with .the

fastener-applying means, a second lever, a roller engaging between the levers and movable longitudinally thereof, said first-mentioned lever having a cam-face engaged by the roller during its longitudinal movement thereof, and means on the second-mentioned lever for moving the roller longitudinally of the levers.

4. In a device of the type indicated, fastenerapplying means, a lever pivoted at one end and connected with the fastener-applying means at its opposite end, a second lever, a roller engaging between the levers and movable longitudinally thereof, said first-mentioned lever being actuated by the longitudinal movement of the roller to operate the fastener-applying means, and a cam on the second-mentioned lever engaging the roller to move it longitudinally of the levers.

5. In a device of the type indicated, fastenerapplying means, a lever pivoted at one end and connected with the fastener-applying means at its opposite end, a second lever, a roller engaging between the levers and movable longitudinally thereof, said first-.mentioned lever having a camface engaged by the roller during its longitudinal movement to actuate said lever and the fastenerapplying means, and a cam on the second-mentioned lever directly engaging the roller to move it longitudinally of the levers.

6. In a device of the type indicated, fastenerapplying means, a lever connected with the fastener-applying means, a second lever, a rollel` engaging between the levers and movable longitudinally thereof, means for guiding the roller in an angular path with respect to said levers, and means on the second-mentioned lever for moving the roller in the guiding means to rock the rstmentioned lever to operate the fastener-applying means.

7. In a fastener-applying implement, a frame, staple-applying means on the frame including a staple-driver, an actuating lever pivoted at one end and connected with the staple-driver at its opposite end', a hand-operated lever pivoted to the frame at one end, a roller engaging between the levers and movable longitudinally thereof, and means on said hand-operated lever for moving the roller along the actuating lever to operate the staple-driver.

8. In a fastener-applying implement, a hollow frame, staple-applying means in the frame including a staple-driver, .an actuating lever pivoted at one end and connected with the staple-driver at its opposite end, a hand-operated lever pivoted to the frame at one end, a roller engaging between the levers and movable longitudinally thereof, and a cam on the hand-operated lever for moving the roller longitudinally of the actuating lever to rock the latter about its pivot to operate the staple-driver.

9. In a device of the type indicated, a hollow frame, staple-applying means pivotally mounted on the frame and including a staple-driver, a lever pivotedat one end and connected with the staple-driver at its opposite end, a second lever pivoted to the frame at one end, and a roller engaging between the levers and movable longitudinally thereof, said roller actuated by the second-mentioned lever to move it along the rstmentioned lever to rock the staple-applying means about its pivot and operate the stapledriver.

10. In a fastener-applying implement, a hollow frame, staple-applying means in the frame including Va staple-driver, an actuating lever pivoted at one end and connected with the stapledriver at its opposite end, a manually-operative lever pivoted at one end on the frame, a roller engagingA between the levers and movable longitudinally thereof, guideways in the frame for guiding the roller forwardly and downwardly, and means non the hand-operated lever for moving'fthe roller in the guideways and alongn the actuating lever to joperate the staple-driver. n l1. In a fastener-applying implement, a hollow frame, staple-applying means in the frame including a staple-driver, a lever pivoted at one end and connected with the staple-driver at its opposite'end, said lever having a cam-face intermediate its ends, a manually-operative lever pivoted at erle end on the frame, a. roller engaging between the levers and movable longitudinally tliereof, guideways'in the frame for guiding the roller forwardly and downwardly, and a cam-face on the manually-operative iever for moving the roller in the guideways and against the cam-face on ther actuating lever to operate the stapledriver. i

112. In afastener-applying implement, a hollow frame comprising complementary sidef members, staple-applying 'means pivotally mounted l en the frame between its sides and including a staple-driver, a lever pivoted at one end and connected with the staple-driver at its opposite end, amanuallypperative lever` pivotally mountedon the frame between its sides, a roller be-` tween the levers and movable longitudinally thereof,jguiding grooves in the opposite sides of the frame into which the ends of the roller project, said grooves extending at an angle to the levers to guide theroller along the actuating lever to Voperate the staple-driver, and means on the manually-operative lever for moving the roller in the grooves. Y, Y

` 13. In a4 fastener-applying implement, a hollow framehaving an opening therein to form a finger-grip, fastener-applying,k means in the frame positioned belowrthe finger-grip, a handoperated lever pivoted at one end on the frame and overlying the finger-grip whereby the implement may be held and manipulated with one hand, and means mcsunted on the frame lfor movement longitudinally thereof, said last-named means being actuated by depressing the handoperated lever to operate the fastener-applying meanejwith a gradually increasing mechanical advantage. .i

14.v In a fastener-applying implement, a twopart hollow frame formed with aai opening therein to provide a finger-grip, a hand-operated lever pivoted to the frame adiacent one end and overlying the finger-grip whereby the-implement may be held and manipulated with one hand, fastener-applying means mounted in the frame belovtr the finger-grip, an actuating lever for the fastener-applying means, and a roller mounted in the frame for movement longitudinally thereof and engaging between the levers for transmitting motion from the hand-operated lever Vto the actuating lever. Y Y' le i W 15. In a fastener-applyingimplement, a frame having an opening therein to form a finger-grip, a hand-operated-lever pivoted at one end to the frame and overlying the nger-grip, staple-applyingY means in the frame below the finger-grip'and including a staple-driver, means mounted in the frame for movement longitudinallyfthereof, Vsaid last-named means being actuated by pivotal movement vof the hand-operated lever forv actuating the staple-driver, and an anvil-blade tending above the finger-grip, a Vfastener-applying unit pivotally mounted between the sides of the frame below the finger-grip, resilient means for holding the astener-applying unit in its inoperative position, an anvil-blade connected with the frame andnextending forwardly below the ifastener-applying unit, and means mounted in the frame for movement longitudinallyfrthereof,

said last-named means being actuated by the pivotal movement of the hand-piperated lever to rock the fastener-applying unit into engagement with the blade and thereafter operate the unit to drive a fastener.

17. A fastener-applying unit comprising Ya magazine' for containing a supply of fasteners, stanchions at the end of the magazine having bearing shoulders, said stanchions'having slots extending from the bearing shoulders to their marginal edges, and a gate closing the end of the magazine and having inwardly-directed pintles cooperating withrfthe bearing shoulders to pivotally mount the gate, said gate being adapted to bewmountecl on the stanchions by sliding its pintles through the slots into engagement with the bearingshoulders. Y i

18. A fastener-applying unit comprising 'a magazine for Ycontaining a supply of? fasteners, stanchions at the end of the magazine having bearing shoulders, said stanchions having slots extending from the bearing shoulders to their marginal edges, and a gate closing the end of the magazine and having integrally formed inwardlydirected lugsnfor cooperation with the shoulders on the stanchions to pivotally mount the gate, said gate being mounted on the stanchions by sliding the lugs through the marginal slots into engagement with the bearing shoulders.

19.Y A fastener-applying unit comprising a magazine for containing a supply of fasteners, stanchions at the end of the magazine having relatively wide slots forming bearing shoulders and narrower slots extending therefrom tothe marginal edges of the stanchions, a gate for plosing'the end of the magazine having inwardlyrdirected lugs cooperating 'with the bearing shoulders on the stanchions to pivotally mount the gate, said gate being mounted on the stanchions by sliding its lugs through the narrow slots into engagement with the bearing shoulders, and interengaging means on the gate and magazine for latching the gate in closed position.

20. A staple-applying unit comprising a magazine for Ycontaining a supply of staples, a gate pivotally mounted on the magazine ,at its forward end, a staple-driver between the end ofthe magazine and the gate, an actuating lever having one en-d pivoted te the rearward end of the magazine ande-the opposite end connected to the staple-driver, said lever having an abutment intermediate its ends, and a spring extending 1ongjitudinally of the lever with one. end bearing against its top and thewoppositek end bearing against the gate and engaging the abutment on the lever to yieldingly hold the lever in inoperative position and the gate closed.

21. In a staple-applying' unit, a magazine for containing a supply of staples, spaced stanchions atthe forward end of the magazine having slots therein, Ya gate for enclosing theend of the lmagazine having inwardly-directed lugs at its sides projecting into the slots to form trunnions for pivoting the gate, a staple-driver between the gate and the end of the magazine, a lever pivoted to the magazine at one end and connected to the staple-driver atthe opposite end, and a spring engaging the lever at one end with its pposite end engaging the trunnion lugs on the gate to hold the lever in inoperative position and the gate closed.

22. In a fastener-applying unit, a sheet-metal driver-blade adapted to be reciprocated to drive the fasteners, said driver-blade having a pair of relatively long slots arranged in spaced relation and a shorter slot therebetween, and a pivoted pawl bearing against the rearward face of the driver-blade, said pawl cooperating with the shorter slot to preventreverse movement of the driver-blade until a full stroke has been completed in either direction, and said long slots permitting a reverse movement of the pawl at the end of the stroke of the driver-blade in either direction.

23. In a staple-applying unit, a magazine for containing a supply of staples and having spaced stanchions at its forward end, means cooperating with the end of the magazine to forma throat through which the staples are driven, a sheetmetal staple-driver in the throat, said driver having a slot formed therein, means for actuating the staple-driver, and a pawl pivotally mounted between the spaced stanchions and cooperating with the slot in the staple-driver to prevent a return movement of the staple-driver until a full stroke has been completed in either direction.

24. A staple-applying unit comprising a magazine for containing a supply of staples and having spaced stanchions at its forward end, a gate pivotally mounted on the stanchions and adapted to close the end of the magazine, a staple-driver between the gate and the en-d of the magazine, said driver having a pair of relatively long slots disposed in spaced relationship and a shorter slot between the long slots, means for operating said staple-driver, and a pawl pivotally mounted be.- tween the stanchio-ns and adapted to bear against the rearward face of the staple-driver, said long slots permitting the pawl to be reversed at the end of a full stroke in either direction, and said narrow slot engaging the pawl to prevent return movement of the staple-driver until a full stroke has been completed in either direction.

25. In a device of the type indicated, a pivoted stapling arm carrying a staple-driver, said stapling arm being movable from one to the other of two positions, an actuator connected to the stapledriver to operate the latter, a spring between the stapling arm and actuator for normally holding the latter raised with respect to the arm, means for limiting the upward movement of the actuator with respect to the arm, and a second spring connected to the actuator for yieldingly holding the stapling arm in one of its two positions.

26. In a device of the type indicated, a frame, an anvil on the frame having clincher-grooves, a stapling arm pivotally mounted on the frame for movement toward and away from the anvil and carrying a staple-driver for cooperation with the clincher-grooves, an actuator connected to the staple-driver to operate the latter, a spring between the stapling arm and actuator for normally holding the latter raised with respect to the arm, means for limiting the upward movement of the actuator with respect to the arm, and a second spring directly connected to the actuator and the frame for rocking the actuator and arm on the frame away from the anvil.

27. In a device of the type indicated, fastenerapplying means, a lever connected to operate the fastener-applying means, a second lever, means engaging between the levers and movable longitudinally thereof, and means for moving the movable means toward the fulcrum of one lever and away from the fulcrum of the other lever whereby to cause the fastener-applying means to be operated with a progressively increased mechanical advantage.

28. In a fastener-applying implement, a frame having spaced side walls with alined openings therein, a detachable insert in the openings bri-dging the space between the side walls to form a finger-grip, fastener-applying means on said frame, a hand-operated lever pivoted at one end on the frame and overlying the finger-grip whereby the implement may be held and manipulated with one hand, and means connecting the handoperated lever to actuate the fastener-applying means.

29. In a fastener-applying implementa hollow frame having spaced parallel side walls with alined openings therein, an annular insert of resilient material positioned in the openings to form a nger-grip, said insert having grooves in its periphery for receiving the edges of the side walls surrounding the openings to hold it in place, fastener-applying means on the frame, a lever on the frame overlying the finger-grip whereby the implement may be held and manipulated in one hand, and means connecting the lever to operate the fastener-applying means.

JOHN F. CAVANAGH. 

